sideboob vs boob

sideboob and boob both are nouns.

Word	Noun	Adjective	Verb	Adverb
sideboob	Yes	No	No	No
boob	Yes	No	Yes	No

As nouns, boob is a hypernym of sideboob; that is, boob is a word with a broader meaning than sideboob:

sideboob: A breast exposed from the side
boob: either of two soft fleshy milk-secreting glandular organs on the chest of a woman

Other hypernyms of sideboob include bosom, breast, knocker, tit, titty.

sideboob (noun)	boob (noun)
A breast exposed from the side	either of two soft fleshy milk-secreting glandular organs on the chest of a woman
	an ignorant or foolish person

sideboob (verb)	boob (verb)
	commit a faux pas or a fault or make a serious mistake