Sinonim periscope

English Thesaurus

1. an optical instrument that provides a view of an otherwise obstructed field (noun.artifact)

hypernym	:	optical instrument,
definition	:	an instrument designed to aid vision (noun.artifact)

part meronym	:	pigboat, sub, submarine, u-boat,
definition	:	a submersible warship usually armed with torpedoes (noun.artifact)