reaper vs harvester

reaper and harvester both are nouns.

Word	Noun	Adjective	Verb	Adverb
reaper	Yes	No	No	No
harvester	Yes	No	No	No

As nouns, reaper and harvester are synonyms defined as:

reaper and harvester: farm machine that gathers a food crop from the fields

As nouns, reaper and harvester are synonyms defined as:

reaper (noun)	harvester (noun)
farm machine that gathers a food crop from the fields	farm machine that gathers a food crop from the fields
someone who helps to gather the harvest	someone who helps to gather the harvest