The word free can be added to create the word freeloader. It means a person who takes advantage of others' generosity for free food, entertainment, a place to live or money without paying for them.
heavy
There are several letters (such as: f, i, n, s) that can be added to the word, letter, to make a new word. Example: fettler, retitle, nettler, trestle.
sweed
ELF
Ice can be added to all three: icehouse, icecap, iceman.
make.
plus
It is "M".
day
post = signpost.
Post, as in postcard.
consign and signage