Some words with the root "dign" meaning worthy include dignity, dignified, dignify, and dignitary. The root "dign" is derived from the Latin word "dignus," meaning worthy or appropriate.
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...
Rapid, speedy.
A lab or a demonstration.
astray
luckily, gratefully
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.