Difference between late and later

[Guest]

Test No. incompl/elem-19 "Late Again", question 7

Simply that you're going to be ......... for work.

(a) late
(b) later
(c) lately
(d) latest

Test No. incompl/elem-19 "Late Again", answer 7

Simply that you're going to be late for work.

Correct answer: (a) late

Your answer was: incorrect
Simply that you're going to be later for work.
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when i must use these two words please explain it easy way thank so much

[Alan]

Both are adjectives and later is the comparative form.
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English as a Second Language
You can read my ESL story Saying It Twice