memory trace vs engram

memory trace and engram both are nouns.

Word	Noun	Adjective	Verb	Adverb
memory trace	Yes	No	No	No
engram	Yes	No	No	No

As nouns, memory trace and engram are synonyms defined as:

memory trace and engram: a postulated biochemical change (presumably in neural tissue) that represents a memory

memory trace (noun)	engram (noun)
a postulated biochemical change (presumably in neural tissue) that represents a memory	a postulated biochemical change (presumably in neural tissue) that represents a memory