heliocentric parallax vs annual parallax

heliocentric parallax and annual parallax both are nouns.

Word	Noun	Adjective	Verb	Adverb
heliocentric parallax	Yes	No	No	No
annual parallax	Yes	No	No	No

As nouns, heliocentric parallax and annual parallax are synonyms defined as:

heliocentric parallax and annual parallax: the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline

heliocentric parallax (noun)	annual parallax (noun)
the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline	the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline