WordNet sense 1 (a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll):

dog, frankfurter, hotdog, weenie, wiener, wienerwurst

WordNet sense 2 (easily perceived by the senses or grasped by the mind):

obvious

WordNet sense 3 (stamp with a postmark to indicate date and time of mailing):

postmark

WordNet sense 4 (characterized by directness in manner or speech; without subtlety or evasion):

blunt, candid, forthright, outspoken, plainspoken, point-blank, free-spoken, straight-from-the-shoulder

WordNet sense 5 (extended senses; direct in means or manner or behavior or language or action):

direct