engram vs memory trace

engram and memory trace both are nouns.

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

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

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

engram (noun)	memory trace (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