bo's'n vs bo'sun

bo's'n and bo'sun both are nouns.

Word	Noun	Adjective	Verb	Adverb
bo's'n	Yes	No	No	No
bo'sun	Yes	No	No	No

As nouns, bo's'n and bo'sun are synonyms defined as:

bo's'n and bo'sun: a petty officer on a merchant ship who controls the work of other seamen

Other synonyms of bo's'n include boatswain, bos'n, bosun.

bo's'n (noun)	bo'sun (noun)
a petty officer on a merchant ship who controls the work of other seamen	a petty officer on a merchant ship who controls the work of other seamen