heliograph vs apparatus

heliograph and apparatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
heliograph	Yes	No	Yes	No
apparatus	Yes	No	No	No

As nouns, apparatus is a hypernym of heliograph; that is, apparatus is a word with a broader meaning than heliograph:

heliograph: an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
apparatus: equipment designed to serve a specific function

Other hypernyms of heliograph include setup.

heliograph (noun)	apparatus (noun)
an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on	equipment designed to serve a specific function
	(anatomy) a group of body parts that work together to perform a given function

heliograph (verb)	apparatus (verb)
signal by means of a mirror and the using the sun's rays