implication vs innuendo

implication and innuendo both are nouns.

Word	Noun	Adjective	Verb	Adverb
implication	Yes	No	No	No
innuendo	Yes	No	No	No

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

implication: an accusation that brings into intimate and usually incriminating connection
innuendo: an indirect (and usually malicious) implication

Other hyponyms of implication include unspoken accusation, veiled accusation, insinuation.

implication (noun)	innuendo (noun)
a meaning that is not expressly stated but can be inferred	an indirect (and usually malicious) implication
something that is inferred (deduced or entailed or implied)
an accusation that brings into intimate and usually incriminating connection
a relation implicated by virtue of involvement or close connection (especially an incriminating involvement)
a logical relation between propositions p and q of the form `if p then q'; if p is true then q cannot be false