knotholes

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plural of knothole
knothole
In a piece of lumber, a knothole is a void left by a knot in the wood; such holes are often convenient for peering through when they occur in fences

Red Gilbat was nutty....When the gong rang at the ball grounds there were ten chances to one that Red would not be present. He had been discovered with small boys peeping through knotholes at the vacant left field he was supposed to inhabit during play.

knothole
{i} hole in a piece of lumber where a knot once was
knothole
a hole in a board where a knot came out