Low pitch and Profundity

Low pitch noun - A pitch that is perceived as below other pitches.

Profundity and low pitch are semantically related. In some cases you can use "Profundity" instead a noun phrase "Low pitch".

Profundity noun - The quality of being great in extent (as of insight).

Low pitch and profundity are semantically related. Sometimes you can use "Low pitch" instead a noun "Profundity".