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"FEWER" and "LESS"
"Fewer" is used for countable items. "Less" is used for uncountable quantities. Ex.: We need fewer chairs. There is less water in the bottle.
"LED" and "LEAD"
"Led" is the past tense of the verb "to lead." "Lead" can be a verb meaning to guide or a noun referring to a type of metal. Ex.: She led the team to victory. He will lead the project. The pipes are made of lead.