quibble vs niggle

quibble is a noun but niggle is not a noun.

Word	Noun	Adjective	Verb	Adverb
quibble	Yes	No	Yes	No
niggle	No	No	Yes	No

As verbs, quibble and niggle are synonyms defined as:

Other synonyms of quibble include bicker, brabble, pettifog, squabble.

quibble (noun)	niggle (noun)
an evasion of the point of an argument by raising irrelevant distinctions or objections

quibble (verb)	niggle (verb)
argue over petty things	argue over petty things
evade the truth of a point or question by raising irrelevant objections	worry unnecessarily or excessively