Term: obstacle: an obstruction that stands in the way (and must be removed or surmounted or circumvented)
Broader: artifact: a man-made object taken as a whole | Unrelated: ringer's solution: an aqueous solution containing the chlorides of sodium and potassium and calcium that is isotonic to animal tissues; used to correct dehydration and (in physiological experiments) as a medium for in vitro preparations
Broader: artifact: a man-made object taken as a whole | Unrelated: backache: an ache localized in the back
Broader: artifact: a man-made object taken as a whole | Unrelated: topper: a worker who cuts tops off (of trees or vegetables etc.)
Broader: artifact: a man-made object taken as a whole | Unrelated: golden pothos: evergreen liana widely cultivated for its variegated foliage
Broader: artifact: a man-made object taken as a whole | Unrelated: summer squash: any of various usually bushy plants producing fruit that is eaten while immature and before the rind or seeds harden
Broader: artifact: a man-made object taken as a whole | Unrelated: manila hemp: a kind of hemp obtained from the abaca plant in the Philippines
Broader: artifact: a man-made object taken as a whole | Unrelated: vector sum: a vector that is the sum of two or more other vectors
Broader: artifact: a man-made object taken as a whole | Unrelated: crime wave: a sudden rise in the crime rate
Broader: artifact: a man-made object taken as a whole | Unrelated: sphyraenidae: monotypic family of large active fishes of tropical and subtropical waters: barracuda
Broader: artifact: a man-made object taken as a whole | Unrelated: big science: scientific research that requires massive capital investment but is expected to yield very significant results