boss vs nailhead

boss and nailhead both are nouns.

Word	Noun	Adjective	Verb	Adverb
boss	Yes	Yes	Yes	No
nailhead	Yes	No	No	No

As nouns, nailhead is a hyponym of boss; that is, nailhead is a word with a more specific, narrower meaning than boss:

Other hyponyms of boss include knobble.

boss (noun)	nailhead (noun)
a circular rounded projection or protuberance	flattened boss on the end of nail opposite to the point
a person responsible for hiring workers	something resembling the head of a nail that is used as an ornamental device
a person who exercises control over workers
a leader in a political party who controls votes and dictates appointments
a person who exercises control and makes decisions

boss (adjective)	nailhead (adjective)
exceptionally good

boss (verb)	nailhead (verb)
raise in a relief