Crossword puzzle clue "sound study"

to pack tightly

NERD, a person obsessed with computers at the expense of human interaction, also NURD

ACOUSTIC, a sense of hearing

HARMONIC, a musical tone with a frequency that is a multiple of the fundamental frequency

the branch of linguistics that deals with pronunciation and speech production, also PHONICS

AMP, (Australian slang) to excite

to make a roaring sound