average, medium
lean (esp. AmE), slender, slight, slim, small, thin
heavy, muscular, powerful, stocky, strong
athletic

in build
He's heavier in build than his brother.

of build
She is slight of build and very agile.

with a build
a small woman with a slim build

Build is used with these nouns as the subject:
builder, developer, engineer, tension

Build is used with these nouns as the object:
addition, alliance, altar, appetite, application, arch, archive, arena, argument, awareness, barracks, barricade, barrier, base, boat, bomb, bonfire, bridge, building, business, bypass, canal, car, career, castle, cathedral, character, church, circuit, city, civilization, clientele, coalition, company, complex, computer, confidence, consensus, constituency, cottage, course, credibility, culture, dam, database, defence, democracy, device, dock, dwelling, dynasty, economy, empire, endurance, engine, enterprise, estate, esteem, expectation, extension, facility, factory, fantasy, farm, fence, fire, fireplace, fitness, flat, fort, fortress, fortune, foundation, framework, franchise, friendship, fund, garage, headquarters, highway, home, hotel, house, housing, hut, identity, image, institution, instrument, lead, library, life, link, loyalty, machine, majority, mall, mansion, memorial, military, model, monument, morale, motor, motorway, muscle, museum, nation, navy, neighbourhood, nest, palace, park, partition, partnership, party, picture, pipeline, plane, plant, pond, pool, prison, profile, prototype, résumé, raft, railway, rapport, reactor, relationship, repertoire, replica, republic, reputation, reserve, residence, resilience, road, self-confidence, set, shelf, shelter, ship, shopping centre, shrine, site, skyscraper, socialism, society, solidarity, spacecraft, squad, stadium, stamina, strength, structure, support, suspense, system, team, telescope, tension, town, track, traffic, trust, tunnel, understanding, unit, villa, vocabulary, wall, wardrobe, warehouse, warship, wealth, weapon, web, website, wing