sideboob vs titty

sideboob and titty both are nouns.

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

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

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

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

sideboob (noun)	titty (noun)
A breast exposed from the side	either of two soft fleshy milk-secreting glandular organs on the chest of a woman