tomtit vs tit

tomtit and tit both are nouns.

Word	Noun	Adjective	Verb	Adverb
tomtit	Yes	No	No	No
tit	Yes	No	No	No

As nouns, tit is a hypernym of tomtit; that is, tit is a word with a broader meaning than tomtit:

tomtit: widely distributed European titmouse with bright cobalt blue wings and tail and crown of the head
tit: small insectivorous birds

Other hypernyms of tomtit include titmouse.

tomtit (noun)	tit (noun)
widely distributed European titmouse with bright cobalt blue wings and tail and crown of the head	small insectivorous birds
	either of two soft fleshy milk-secreting glandular organs on the chest of a woman
	the small projection of a mammary gland