subsonic

As an adjective subsonic

is having a frequency too low to be audible.

As a proper noun UNISON is

a public sector trade union in the UK.

As a noun unison is

the state of being together, in harmony, at the same time, as one, synchronized.

As adjectives the difference between subsonic and subtonic

is that subsonic is having a frequency too low to be audible while subtonic is of or pertaining to imperfectly articulated sounds or utterances that are inaudible or barely audible, as characterized by Dr. James Rush (Guide to Pronunciation, 1833).

As a noun subtonic is

the note immediately below the upper note of a musical scale.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective subsonic is

(of a sound) having a frequency too low to be audible.

As an adjective subsonic

is having a frequency too low to be audible.

As an adverb subsonically is

in a subsonic manner.

As adjectives the difference between subsonic and subacoustic

is that subsonic is having a frequency too low to be audible while subacoustic is subsonic.

As an adjective subsonic

is (of a sound) having a frequency too low to be audible.

As a noun wadcutter is

(firearms) a special-purpose bullet designed for shooting paper targets, usually at close range and at subsonic velocities.

Subsonic is a see also of sublumic.

As adjectives the difference between subsonic and sublumic

is that subsonic is (of a sound) having a frequency too low to be audible while sublumic is slower-than-light; having a speed less than light.

Subsonic is a see also of subluminal.

As adjectives the difference between subsonic and subluminal

is that subsonic is (of a sound) having a frequency too low to be audible while subluminal is slower-than-light; having a speed less than light.