Do you know ghouls from goblins and ghosts?
early 15c., from Old French consonant (13c.), from Latin consonantem (nominative consonans), present participle of consonare (see consonant (n.)).
Letters of the alphabet that stand for sounds often made with a closed or partially closed mouth: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Z, and sometimes Y (as in yellow). (Compare vowels.)