Straight (Adjective) = Without a curve or bend.
Synonyms: Beeline, Direct, Level, Linear, Through, Unbent
Example: Two parallel straight lines don’t coincide at any point.
Strait (Noun) = A narrow passage of water connecting two seas
Synonyms: Branch, Channel, Inlet, Pass, Rivulet
Example: The Strait of Gibraltar is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea.