Herschelian telescope vs off-axis reflector

Herschelian telescope and off-axis reflector both are nouns.

Word	Noun	Adjective	Verb	Adverb
Herschelian telescope	Yes	No	No	No
off-axis reflector	Yes	No	No	No

As nouns, Herschelian telescope and off-axis reflector are synonyms defined as:

Herschelian telescope and off-axis reflector: a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed

Herschelian telescope (noun)	off-axis reflector (noun)
a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed	a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed