Diphthong and Speech sound

Diphthong noun - A vowel sound that starts near the articulatory position for one vowel and moves toward the position for another.

Speech sound and diphthong are semantically related In some cases you can replace phrase "Speech sound" with "Diphthong", this terms are similar.

Nearby Word: diphthongal

Speech sound noun - (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language.

Diphthong and speech sound are semantically related in sound unit of speech topic. You can use "Diphthong" instead a noun phrase "Speech sound".