Obstruct
Part of speech: verb
Definition: To block or fill (a passage) with obstacles or an obstacle. See Synonyms at block. To impede, retard, or interfere with; hinder: obstructed my progress. To get in the way of so as to hide from sight.
Stymie
Part of speech: verb
Definition: To thwart or stump; to cause to fail or to leave hopelessly puzzled, confused, or stuck.
Part of speech: noun
Definition: An obstacle or obstruction.A situation where an opponent's ball is directly in the way of one's own ball and the hole, on the putting green.