forelock vs quiff

forelock and quiff both are nouns.

Word	Noun	Adjective	Verb	Adverb
forelock	Yes	No	No	No
quiff	Yes	No	No	No

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

forelock: a lock of hair growing (or falling) over the forehead
quiff: a prominent forelock (especially one brushed upward from the forehead)

forelock (noun)	quiff (noun)
a lock of a horse's mane that grows forward between the ears	a prominent forelock (especially one brushed upward from the forehead)
a lock of hair growing (or falling) over the forehead