witches' broom vs tuft

witches' broom and tuft both are nouns.

Word	Noun	Adjective	Verb	Adverb
witches' broom	Yes	No	No	No
tuft	Yes	No	No	No

As nouns, tuft is a hypernym of witches' broom; that is, tuft is a word with a broader meaning than witches' broom:

witches' broom: an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance
tuft: a bunch of hair or feathers or growing grass

Other hypernyms of witches' broom include tussock.

witches' broom (noun)	tuft (noun)
an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance	a bunch of feathers or hair
	a bunch of hair or feathers or growing grass