Now updated for CSW19. New words, if any, and new inflections of existing words, are shown in red. There were no changes to the two letter words in either the CSW21 or CSW24 updates.
| aa | (Hawaiian) a type of lava > AAS. |
| ab | An abdominal muscle > ABS. |
| ad | (Coll.) advertisement > ADS. |
| ae | (Scots) one. No -S. |
| ag | (Short for) agricultural; (noun) agriculture > AGS. |
| ah | Interjection expressing surprise, joy etc > AHS, AHING, AHED. |
| ai | (Tupi) the three-toed sloth > AIS. |
| al | An E. Indian shrub > ALS. |
| am | Present tense of be. |
| an | Indefinite article; (noun) something that might have happened but did not, as in ifs and ans > ANS. |
| ar | The letter r > ARS. |
| as | In whatever way; (noun) a Norse god > AESIR; a gravel ridge or KAME > ASAR; a Roman coin > ASSES. |
| at | Preposition denoting position in space or time; (noun) a monetary unit of Laos > ATS. |
| aw | Interjection expressing disappointment, sympathy etc. |
| ax | (US) axe > AXES. |
| ay | (Noun) an affirmative vote > AYS. Also AYE. |
| ba | In ancient Egyptian religion, the soul > BAS. |
| be | To exist. |
| bi | (Short for) bisexual > BIS. |
| bo | Fellow; pal, buddy > BOS. |
| by | Beside, near; (noun) same as BYE > BYS. |
| ch | (Obs. dial.) pronoun meaning I. |
| da | (Burmese) a heavy Burmese knife > DAS. Also DAH. |
| de | From (as used in names). |
| di | (Pl.) DEUS, a god. |
| do | A musical note: DOS; (verb) to perform > DOES, DOING, DID, DONE. |
| ea | (Dial.) river > EAS. |
| ed | (Short for) education > EDS. |
| ee | (Scots) eye > EEN. |
| ef | The letter f. |
| eh | Interjection expressing enquiry; (verb) to say 'eh' > EHS, EHING, EHED. |
| el | The letter l > ELS. |
| em | The letter M; a unit of measurement in printing > EMS. |
| en | The letter N; a unit in printing > ENS. |
| er | An interjection expressing hesitation. |
| es | The letter S > ESES. Also ESS. |
| et | (Obs.) pt. EAT. |
| ew | Interjection used to express disgust. |
| ex | The letter X; someone no longer in a previous relationship > EXES; (verb) to cross out > EXING, EXED. |
| fa | A musical note, as in sol-fa > FAS. |
| fe | (Hebrew) a Hebrew letter > FES |
| fy | An interjection expressing reproach. No -S hook. Also FIE. |
| gi | (Japanese) a judo or karate costume > GIS. Also GIE. |
| go | To pass from one place to another > GOES, GOING, WENT, GONE; (noun) a board game > GOS. |
| gu | (ON) a kind of violin formerly used in the Shetlands. Also GUE, GJU. |
| ha | An interjection expressing e.g. surprise. |
| he | A male person > HES. |
| hi | An interjection calling attention. |
| hm | An interjection expressing hesitation. Also HMM. |
| ho | Interjection calling attention, expressing surprise etc. Also HOH. |
| id | A fish of the carp family > IDS. Also IDE. |
| if | On condition that; (noun) a condition > IFS. |
| in | (Verb) to take in > INS, INNING, INNED. |
| io | An interjection expressing joy, triumph, grief; (noun) a cry of 'io' > IOS. |
| is | (3rd.) BE, to exist. |
| it | The neuter of he she him or her. |
| ja | Yes. |
| jo | (Scots) a loved one > JOES. |
| ka | The spirit or soul of a dead person; (verb) to serve > KAS, KAING, KAED. Also KAE. |
| ki | (Japanese) the spirit of Japanese martial art > KIS. Also QI, CHI. |
| ko | (Maori) a digging-stick > KOS. |
| ky | Cattle. No -S. Also KYE. |
| la | A musical note > LAS. |
| li | (Chinese) a Chinese unit of distance > LIS. |
| lo | An interjection meaning see, look. |
| ma | (Coll.) mother > MAS. |
| me | A musical note > MES. |
| mi | A musical note > MIS. |
| mm | An interjection expressing agreement. |
| mo | A moment > MOS. |
| mu | (Greek) a letter of the Greek alphabet > MUS. |
| my | Of or belonging to me. |
| na | (Scots) no, not at all. |
| ne | (Obs.) not. |
| no | Word of negation > NOS or NOES. |
| nu | (Greek) a letter in the Greek alphabet > NUS. |
| ny | (Verb) to approach > NYES, NYING, NYED. Also NIE > NIES, NYING, NIES. |
| ob | An objection > OBS. |
| od | A hypothetical force; an old word for god, often used as a mild oath > ODS. |
| oe | (Scots) a grandchild > OES. Also OY, OYE. |
| of | Belonging to. |
| oh | An interjection; (verb) to say OH > OHS, OHING, OHED. |
| oi | An interjection used to express attention; (noun) the grey-faced petrel > OIS. |
| ok | (Adjective) all right. |
| om | An intoned Hindu sacred symbol > OMS. |
| on | (Verb) to go on with, to put up with > ONS, ONNING, ONNED. |
| oo | (Scots) wool > OOS. |
| op | (Short for) operation > OPS. |
| or | (Noun) the heraldic tincture gold > ORS. |
| os | (Lat.) 1. a bone > OSSA. 2. a mouthlike opening > ORA. |
| ou | (Scots) an interjection expressing concession; (noun) a bloke > OUS. |
| ow | An interjection expressing pain. |
| ox | A bovine animal > OXEN; also, a clumsy person > OXES. |
| oy | (Scots) a grandchild > OYS. Also OE, OYE. |
| pa | (Maori) a hill fort > PAS. Also PAH. |
| pe | (Hebrew) a Hebrew letter > PES. Also PEH, FEH. |
| pi | (Greek) a letter in the Greek alphabet > PIS. |
| po | (Short for) chamberpot > POS. |
| qi | (Chinese) the physical life-force postulated by certain Chinese philosophers > QIS. |
| re | A musical note > RES. |
| sh | An interjection requesting silence. Also SHA, SHH. |
| si | An earlier form of TI, a musical note. |
| so | In such a way; (noun) a musical note > SOS. |
| st | An interjection requesting silence. |
| ta | An interjection expressing thanks > TAS. |
| te | = TI, a musical note > TES. |
| ti | A musical note; a small Pacific tree > TIS. |
| to | In the direction of, towards. |
| ug | To dread, loathe > UGS, UGGING, UGGED. [ON ugga, to fear, dread]. |
| uh | An interjection expressing surprise. |
| um | An interjection expressing doubt or hesitation; (verb) to express hesitation > UMS, UMMING, UMMED. |
| un | (Dial.) one > UNS. |
| up | (Verb) to move up > UPS, UPPING, UPPED. |
| ur | An interjection expressing hesitation. |
| us | Pronoun. |
| ut | A musical note > UTS. |
| we | Pronoun. |
| wo | Woe > WOS. |
| xi | (Greek) a letter in the Greek alphabet > XIS. |
| xu | A Vietnamese monetary unit > XU. No -S. |
| ya | an Asian pear >YAS. |
| ye | (Arch.) you. |
| yo | An interjection calling for effort or attention |
| yu | (Chinese) a precious jade > YUS. |
| za | (Sl.) pizza > ZAS. |
| ze | A gender-neutral pronoun. |
| zo | (Tibetan) a kind of yak > ZOS. Also ZHO, DZO, DSO, DZHO. |