ideograph vs ideogram

ideograph and ideogram both are nouns.

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

As nouns, ideograph and ideogram are synonyms defined as:

ideograph and ideogram: a graphic character that indicates the meaning of a thing without indicating the sounds used to say it

ideograph (noun)	ideogram (noun)
a graphic character that indicates the meaning of a thing without indicating the sounds used to say it	a graphic character that indicates the meaning of a thing without indicating the sounds used to say it