hectograph vs heliotype

hectograph and heliotype both are nouns.

Word	Noun	Adjective	Verb	Adverb
hectograph	Yes	No	Yes	No
heliotype	Yes	No	No	No

As nouns, hectograph and heliotype are synonyms defined as:

hectograph and heliotype: duplicator consisting of a gelatin plate from which ink can be taken to make a copy

hectograph (noun)	heliotype (noun)
duplicator consisting of a gelatin plate from which ink can be taken to make a copy	duplicator consisting of a gelatin plate from which ink can be taken to make a copy

hectograph (verb)	heliotype (verb)
copy on a duplicator