This soap will really soften your hands
Thawing a frozen turkey will soften it.
To soften the pillow we wash it lots of times.
This baffle will soften the lighting in this part of the room.
I used a hair conditioner to help soften my hair and make it more manageable.
Melt
"As he held her in his arms, despite the years of neglect and hate that had developed between them, he felt her heart soften."
I am not writing a sentence using that word.
I can give you a sentence using the word galaxy.
This is a sentence using the word aviator.
a sentence using the word endotracheal
This is a sentence using the word monomer. :P
I am saying a sentence using the word collagen.