fiction
there is NO antonym for envelopes due to the fact that it is a noun.
fact
synonym: truth, actuality antonym: fabrication, lie
FACT or TRUTH
synonym: Fact Antonym: Lie
An antonym or opposite word for myth would be fact. You could also say nonfiction or reality.
Fact. Real life. Non-fiction.
I don't know...there isn't one...and this is a true fact.
truth, reality, certainty, verity
Some words don't have antonyms (most, in fact). "Kennel" is one such.
No, Up does not mean down. In fact, "down" is the antonym of "up"!
Possible antonyms are:certainty,fact, reality,realization,substance,verity