Solution:

Letter E

Solution:

Mercury

Solution:

The Milky Way

Solution:

A volcano

Solution:

Y (Why)

Solution:

Point

ViewPoint, BoilingPoint, CheckPoint, and PinPoint are the common word used.

Solution:

Eyes

Explanation:
We have black but we are not tea seeds - Pupil of eye
We have white buts we are not lime - sclera of eye
We have water but we are not a river - general tears in eyes to protect eyes.
We have feather but we are not birds - lashes.

Solution:

A keyhole

Explanation:
It goes right through the door but is stuck to the door i.e never comes in or goes out.

Solution:

abracadabra

Solution:

Stationary and Stationery