Verb: To pay attention to, to take notice of.
Noun: Attention, notice, or consideration.
Here are some examples:
Verb:
* Heed my warnings and stay away from the edge of the cliff.
* I urge you to heed the doctor's instructions.
Noun:
* The hikers paid no heed to the warning signs.
* I took heed of her advice and avoided the crowded area.