Collocations for circular - adj.

be, look
The house looks almost circular.

perfectly
He had round unblinking eyes and a perfectly circular head.

almost, nearly, roughly
The crater was two miles across and roughly circular.

Circular is used with these nouns:
argument, base, design, driveway, fashion, hole, letter, logic, motion, orbit, path, reasoning, route, shape, skirt, table, walk