Look in a dictionary and you will find Hourglass.
One such word is whenever.
airtimeanytimebedtimedowntimelunchtimemealtimeovertimeplaytimesometimespringtimesummertimetimebasetimeouttimesharewintertime
roommate
a compound word beginning with cart is any word that begins with cart and has another word in it.
Soulmate is not commonly a compound word but I did find one dictionary entry for the word as compound.
Fallback is a compound word. Falloff and fallout are compound words.
The answer is become.
Sorry! I couldn't find any that start with robe, but did find one that ends with it:-wardrobeSorry!
teardrop gumdrop raindrop dewdrop backdrop
Doable
zebralicious
One such word is whenever.
airtimeanytimebedtimedowntimelunchtimemealtimeovertimeplaytimesometimespringtimesummertimetimebasetimeouttimesharewintertime
backbonebackgroundballparkbaseballbaseboardbasketballbathhousebathtubbathwaterbirdhousebirthdaybirthmarkbirthrightblackbirdblackboardblackmailbloodbathbookmarkbookshelfbluebellbluebirdblueprintboyhoodbrainwavebreadwinnerbreakwaterbrownstonebutterball
Snail
roommate
"Lukewarm."