Physics is naturally a part of the field of natural sciences, as it involves the study of the natural world and its fundamental principles. It also intersects with other disciplines such as mathematics, engineering, and astronomy.
"Wavelength" is a noun.
Dew is a noun.
Inertia is a noun.
An adjective
It can be an adjective if the sentence is something like "We faced physical challenges today." It can also be a noun if you're saying "I'm going to the doctor for my physical."
Speech sounds are specific sounds. The word physics would be pronounced as: fis - ics or fiz - ics
Thermodynamics is part of physics.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is beneath
The part of speech for "answer" is a noun.
The part of speech for "explicit" is an adjective.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.