It was a figment of her imagination.
The monster in her closet turned out to be a figment of her imagination.
The image of a dragon in her mind was merely a figment of her imagination.
if you are using the word "dream" as a noun: allusion, figment [of the imagination]. if you are using it as a verb: wish, hope -B.A.
I am not writing a sentence using that word.
I can give you a sentence using the word galaxy.
a sentence using the word endotracheal
This is a sentence using the word aviator.
I am saying a sentence using the word collagen.
This is a sentence using the word monomer. :P
this is a sentence using the word armchair.
Need a sentence using the word crater?
Please type a sentence using the word assertion.
I can write a sentence using the word scorn!