bo'sun vs bo's'n

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

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

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

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

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

bo'sun (noun)	bo's'n (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