bilateral symmetry vs bilateralism

bilateral symmetry and bilateralism both are nouns.

Word	Noun	Adjective	Verb	Adverb
bilateral symmetry	Yes	No	No	No
bilateralism	Yes	No	No	No

As nouns, bilateral symmetry and bilateralism are synonyms defined as:

bilateral symmetry and bilateralism: the property of being symmetrical about a vertical plane

Other synonyms of bilateral symmetry include bilaterality.

bilateral symmetry (noun)	bilateralism (noun)
the property of being symmetrical about a vertical plane	the property of being symmetrical about a vertical plane