ambiguity vs amphiboly

ambiguity and amphiboly both are nouns.

Word	Noun	Adjective	Verb	Adverb
ambiguity	Yes	No	No	No
amphiboly	Yes	No	No	No

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

ambiguity: an expression whose meaning cannot be determined from its context
amphiboly: an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes

Other hyponyms of ambiguity include loophole, amphibology, parisology, double entendre.

ambiguity (noun)	amphiboly (noun)
unclearness by virtue of having more than one meaning	an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes
an expression whose meaning cannot be determined from its context