The comparative of heavy is "heavier" (having more weight).
carrier
Protector.
Newer.
Freer
CALENDAR : a list of days or months, a schedule (cannot be spelled -er)
He has = Er hat
Happier
carrier
Protector.
Newer.
Freer
Er
yes
The correct spelling of at-er-on-dex is the Adirondacks, a country-like region of North America.
w a t er sign.
exhilarating
endoplasmic reticulum