What is the abstract noun of saw?

The abstract noun of "saw" depends on what kind of saw you're talking about:

* If you're talking about the tool: The abstract noun is sight.

* If you're talking about the past tense of "see": The abstract noun is observation or vision.

For example:

* "I have a new saw for cutting wood." (Tool) - "The sight of the saw in action was impressive."

* "I saw a beautiful bird in the tree." (Past tense) - "My observation of the bird revealed its unique markings."