Are these words used commonly

Hi guys!
I learned some new words so I wanted to know if they were commonly used or not because I picked them from songs.
The words in romaji because my device doesn't have Japanese keyboard. (sorry)
The words:
Omoigakenai.
Kowagaru.
Kasanaru.
Kazoeru.
I thought they weren't commonly used but I read it in a list so I wanted to know if memorizing the words from there was ok.
Thank you so much.

Yes, they are fairly common words.

omoigakenai - adjective meaning "unexpected"

kowagaru/kowagarimasu - verb meaning "to fear, to act like afraid"

kasanaru/kasanarimasu - verb meaning "to come in layers, one after another."

kazoeru/kazoemasu - verb meaning "to count" (something).

Thank you so much for your answer.