Vision (when sight is a noun). My sight/vision is improving.
Spot (when sight is an adjective). I sighted/spotted a strange blue bug.
Some words that have the same meaning as "multiply" are increase, expand, and grow.
Some words that have the same meaning as "signify" are indicate, signal, express, and represent.
Gone
look
Attraction, allurement...
astray
luckily, gratefully
A lab or a demonstration.
Rapid, speedy.
I know that one word that has the same meaning as describe/description would be depiction.
There are some contexts in which the words "may" or "might" have the same meaning as would.
own, have,borrowed,and word like that