protagonist
The main character in a any story, such as a literary work or drama.

Proponent
One who supports something; an advocate

Puberty
The age at which a person is first capable of sexual reproduction.

claustrophobia
The fear of closed, tight places.

elucidate

To make clear; to clarify; to shed light upon.

No man is an island.
Human beings do not thrive when isolated from others. Donne was a Christian but this concept is shared by other religions, principally Buddhism.

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ambi-: both
e.g.: ambivalence

spec-: look
e.g.: spector, spectacular

opp-: opposite
e.g.: opponent

dim-: darken
e.g.: diminish