(phonetics) glottal stop

(phonetics) dorsal

(phonetics, prosody) metathesis (the transposition of letters, syllables or sounds within a word)

(linguistics) sound shift / (linguistics) sound shifts from Old Japanese to Modern Japanese, especially those which are preserved in historical kana usage.

Kyūjitai form of 音楽学 (“musicology”)

orthoepy

soundproofing material; sound-absorbing material

car horn

(mathematics) geometrical

"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).