nucleoplasm vs living substance

nucleoplasm and living substance both are nouns.

Word	Noun	Adjective	Verb	Adverb
nucleoplasm	Yes	No	No	No
living substance	Yes	No	No	No

As nouns, living substance is a hypernym of nucleoplasm; that is, living substance is a word with a broader meaning than nucleoplasm:

nucleoplasm: the protoplasm that constitutes the nucleus of a cell
living substance: the substance of a living cell (including cytoplasm and nucleus)

Other hypernyms of nucleoplasm include protoplasm.

nucleoplasm (noun)	living substance (noun)
the protoplasm that constitutes the nucleus of a cell	the substance of a living cell (including cytoplasm and nucleus)