As nouns the difference between grads and marks
is that grads is plural of grad while marks is plural of lang=en.
As a verb marks is
third-person singular of mark.
As a proper noun Marks is
{{surname|from=given names}} derived from the given name {{term|Mark|lang=en}}.
grads
English
Noun
(head)
Anagrams
*
----
marks
English
Noun
(head)
Derived terms
* full marks
Verb
(head)
(mark)
Derived terms
* X marks the spot
----