logogram vs ideogram

logogram and ideogram both are nouns.

Word	Noun	Adjective	Verb	Adverb
logogram	Yes	No	No	No
ideogram	Yes	No	No	No

As nouns, ideogram is a hypernym of logogram; that is, ideogram is a word with a broader meaning than logogram:

logogram: a single written symbol that represents an entire word or phrase without indicating its pronunciation
ideogram: a graphic character that indicates the meaning of a thing without indicating the sounds used to say it

Other hypernyms of logogram include ideograph.

logogram (noun)	ideogram (noun)
a single written symbol that represents an entire word or phrase without indicating its pronunciation	a graphic character that indicates the meaning of a thing without indicating the sounds used to say it