When “awhile” is spelled as a single word, it is an adverb meaning “for a time” (“stay awhile”); but when “while” is the object of a prepositional phrase, like “Lend me your monkey wrench for a while” the “while” must be separated from the “a.” (But if the preposition “for” were lacking in this sentence, [...]

Sometime means “at an indefinite or unstated time in the future.”
Some time means “a period of time.”
Sometimes means “occasionally, now and then.”
Examples:

“Why don’t you come up sometime and see me?”
(Mae West in She Done Him Wrong, 1933)
“You must give some time to your [...]

If you are delivering newspapers from a bike you can pedal it around the neighborhood (perhaps wearing “pedal-pushers”), but when you sell them from a newsstand you peddle them.
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Thanks Paul Brian

“Carrots” are those crunchy orange vegetables Bugs Bunny is so fond of, but this spelling gets misused for the less familiar words which are pronounced the same but have very different meanings.
Precious stones like diamonds are weighed in carats. The same word is used to express the proportion of pure gold in an alloy, though [...]

You do something well, but a thing is good. The exception is verbs of sensation in phrases such as “the pie smells good,” or “I feel good.” Despite the arguments of nigglers, this is standard usage. Saying “the pie smells well” would imply that the pastry in question had a nose. Similarly, “I feel well” [...]