mute vs tongueless

mute is a noun but tongueless is not a noun.

Word	Noun	Adjective	Verb	Adverb
mute	Yes	Yes	Yes	No
tongueless	No	Yes	No	No

As adjectives, mute and tongueless are synonyms defined as:

Other synonyms of mute include silent, unspoken, wordless.

mute (noun)	tongueless (noun)
a device used to soften the tone of a musical instrument
a deaf person who is unable to speak

mute (adjective)	tongueless (adjective)
expressed without speech	lacking a tongue
unable to speak because of hereditary deafness	expressed without speech

mute (verb)	tongueless (verb)
deaden (a sound or noise), especially by wrapping