Is tap a noun

Yes, the Word 'tap' is a noun (tap, taps) and a verb (tap, taps, tapping, tapped).

The noun 'tap' is a Word for:

• a light blow;
• the sound of a light blow;
• a small metal plate for the sole or heel of a shoe;
• a faucet or spigot;
• a device connected to a telephone used for listening secretly to conversations.

The noun form of the verb to tap is the gerund, tapping.