How to use “a kind/sort of”?
Spider is a kind/sort of insect.
Should I say “A spider”, “Spiders”, or “The spider”?
“insect” or “insects”?

Question

How to use “a kind/sort of”?
Spider is a kind/sort of insect.
Should I say “A spider”, “Spiders”, or “The spider”?  
“insect” or “insects”?

Answer

A spider is a type of insect.  'Kind of insect' would also work.

Answer

A spider isn't an insect; it's an arachnid. But it's kind of like an insect.
A good sentence: Spiders are kind of like insects. (If first noun is plural, so is second noun.)

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