pen
a writing instrument that uses ink
She signed the form with a blue pen.
pen
to write (often formally) or to confine animals
He penned a short note before leaving.
penknife
a small folding knife historically used to sharpen quills
He used a penknife to whittle the stick.
penholder
a container or stand for holding pens
She placed the pens in a ceramic penholder.
penmanship
the art or skill of handwriting
His penmanship is neat and easy to read.
pen pal
a person with whom one exchanges letters
As a teenager she had a pen pal in Japan.
penguin
a flightless, aquatic seabird of the Southern Hemisphere
The penguin waddled across the ice.
open
not closed; to make accessible or uncover
Please keep the window open.
sharpen
to make or become sharp
He sharpened the pencil before drawing.
happen
to occur or take place
Accidents happen when least expected.