Tone-deaf
Part of speech: adjective
Definition: Unable to clearly distinguish the difference in pitch between different notes. Having little appreciation of music, whether or not as a result of (1).
Deaf
Part of speech: adjective
Definition: Not having the faculty of hearing, or only partially able to hear.
Part of speech: noun
Definition: Deaf people considered as a group.
Example sentence: At Gallaudet, deafness isn't an issue. You don't even think about it. Students can pay attention to accounting or psychology or journalism. But when a deaf person goes to another college, no matter how supportive it is, that person doesn't get the same access.