further
 



farther

adjective “more”

EXAMPLE: Laughing will only encourage him further.

adjective refers to distance

EXAMPLE: My cousin lives farther from school than I.

 

fewer




less

Use fewer with countable things

EXAMPLE: The express lane is for fewer than 12 items.

Use less with things that are not countable

EXAMPLE: There’s a lot less noise here in the evening.