adaptation, duplicate in form either a native word or another borrowing. So, in the group of homonyms rite, n. — to write, v. — right, adj. the second and third words are of native origin whereas rite is a Latin borrowing (< Lat. ritus). In the pair piece, n. — peace, п., the first originates from O.F. pais, and the second from O.F. (< Gaulish) pettia. Bank, n. ("shore") is a native word, and bank, n. ("a financial institution") is an Italian borrowing. Fair, adj. (as in a fair deal, it's not fair) is native, and fair, n. ("a gathering of buyers and sellers") is a French borrowing. Match, n. ("a game; a contest of skill, strength") is native, and match, n. ("a slender short piece of wood used for producing fire") is a French borrowing.
Word-building also contributes significantly to the growth of homonymy, and the most important type in this respect is undoubtedly conversion. Such pairs of words as comb, n. — to comb, v., pale, adj. — to pale, v., to make, v. — make, n. are numerous in the vocabulary. Homonyms of this type, which are the same in sound and spelling but refer to different categories of parts of speech, are called lexico-grammatical homonyms. 
Shortening is a further type of word-building which increases the number of homonyms. E.g. fan, n. in the sense of "an enthusiastic admirer of some kind of sport or of an actor, singer, etc." is a shortening produced from fanatic. Its homonym is a Latin borrowing fan, n. which denotes an implement for waving lightly to produce a cool current of air. The noun rep, n. denoting a kind of fabric (cf. with the R. репс) has three homonyms made by shortening: rep, n. (< repertory), rep, n. (< representative), rep, n. (< reputation)', all the three are informal words.
During World War II girls serving in the Women's Royal Naval Service (an auxiliary of the British Royal Navy) were jokingly nicknamed Wrens (informal). This