Kleenex vs tissue paper

Kleenex and tissue paper both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kleenex	Yes	No	No	No
tissue paper	Yes	No	No	No

As nouns, tissue paper is a hypernym of Kleenex; that is, tissue paper is a word with a broader meaning than Kleenex:

Kleenex: a piece of soft absorbent paper (usually two or more thin layers) used as a disposable handkerchief
tissue paper: a soft thin (usually translucent) paper

Other hypernyms of Kleenex include tissue.

Kleenex (noun)	tissue paper (noun)
a piece of soft absorbent paper (usually two or more thin layers) used as a disposable handkerchief	a soft thin (usually translucent) paper