Term: keystone: the central building block at the top of an arch or vault
Candidate hypernym: building block: a block of material used in construction work → 1
Candidate hypernym: leadplant: shrub of sandy woodlands and stream banks of western United States having hoary pinnate flowers and dull-colored racemose flowers; thought to indicate the presence of lead ore → 0
Candidate hypernym: crown colony: a British colony controlled by the British Crown, represented by a governor → 0
Candidate hypernym: cannel coal: a bituminous coal that burns with a luminous flame → 0
Candidate hypernym: butterfly plant: orchid having large elliptic to obovate fleshy leaves and fragrant pink-and-white flowers dotted with red → 0
Candidate hypernym: shipper: someone who ships goods → 0
Candidate hypernym: jacob's rod: asphodel having erect smooth unbranched stem either flexuous or straight → 0
Candidate hypernym: souchong: a fine quality of black tea native to China → 0
Candidate hypernym: sundial: timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial → 0
Candidate hypernym: teddy boys: a British youth subculture that first appeared in the 1950s; mainly from unskilled backgrounds, they adopted a pseudo-Edwardian dress code and rock'n'roll music; proletarian and xenophobic, they were involved in race riots in the United Kingdom → 0
Candidate hypernym: theater light: any of various lights used in a theater → 0