ultramicroscope vs dark-field microscope

ultramicroscope and dark-field microscope both are nouns.

Word	Noun	Adjective	Verb	Adverb
ultramicroscope	Yes	No	No	No
dark-field microscope	Yes	No	No	No

As nouns, ultramicroscope and dark-field microscope are synonyms defined as:

ultramicroscope and dark-field microscope: light microscope that uses scattered light to show particles too small to see with ordinary microscopes

ultramicroscope (noun)	dark-field microscope (noun)
light microscope that uses scattered light to show particles too small to see with ordinary microscopes	light microscope that uses scattered light to show particles too small to see with ordinary microscopes