Nouns

(n)poreany tiny hole admitting passage of a liquid (fluid or gas)
(n)poreany small opening in the skin or outer surface of an animal
(n)stoma, stomate, porea minute epidermal pore in a leaf or stem through which gases and water vapor can pass

Verbs

(v)concentrate, focus, center, centre, pore, rivetdirect one's attention on something“Please focus on your studies and not on your hobbies”