nickel-and-dime vs penny-pinch

nickel-and-dime is an adjective but penny-pinch is not an adjective.

Word	Noun	Adjective	Verb	Adverb
nickel-and-dime	No	Yes	Yes	No
penny-pinch	No	No	Yes	No

As verbs, nickel-and-dime and penny-pinch are synonyms defined as:

nickel-and-dime and penny-pinch: spend money frugally; spend as little as possible

nickel-and-dime (adjective)	penny-pinch (adjective)
low-paying
of minor importance

nickel-and-dime (verb)	penny-pinch (verb)
accumulate gradually	spend money frugally; spend as little as possible
spend money frugally; spend as little as possible