summation vs assemblage

summation and assemblage both are nouns.

Word	Noun	Adjective	Verb	Adverb
summation	Yes	No	No	No
assemblage	Yes	No	No	No

As nouns, assemblage is a hypernym of summation; that is, assemblage is a word with a broader meaning than summation:

Other hypernyms of summation include accumulation, aggregation, collection.

summation (noun)	assemblage (noun)
the arithmetic operation of summing; calculating the sum of two or more numbers	the social act of assembling
a concluding summary (as in presenting a case before a law court)	a system of components assembled together for a particular purpose
the final aggregate	a group of persons together in one place
(physiology) the process whereby multiple stimuli can produce a response (in a muscle or nerve or other part) that one stimulus alone does not produce	several things grouped together or considered as a whole