plant tissue vs cortex

plant tissue and cortex both are nouns.

Word	Noun	Adjective	Verb	Adverb
plant tissue	Yes	No	No	No
cortex	Yes	No	No	No

As nouns, cortex is a hyponym of plant tissue; that is, cortex is a word with a more specific, narrower meaning than plant tissue:

plant tissue: the tissue of a plant
cortex: the tissue forming the outer layer of an organ or structure in plant or animal

plant tissue (noun)	cortex (noun)
the tissue of a plant	the tissue forming the outer layer of an organ or structure in plant or animal
	the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
	the tissue that surrounds the lens nucleus