crisp vs nippy

crisp is a noun but nippy is not a noun.

Word	Noun	Adjective	Verb	Adverb
crisp	Yes	Yes	Yes	No
nippy	No	Yes	No	No

As adjectives, crisp and nippy are synonyms defined as:

Other synonyms of crisp include frosty, nipping, snappy.

crisp (noun)	nippy (noun)
a thin crisp slice of potato fried in deep fat

crisp (adjective)	nippy (adjective)
pleasantly cold and invigorating	pleasantly cold and invigorating
brief and to the point; effectively cut short	a sharp biting taste
(of hair) in small tight curls
(of something seen or heard) clearly defined
pleasingly firm and fresh
tender and brittle

crisp (verb)	nippy (verb)
make brown and crisp by heating
make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic