Struo

English word strew means “to spread loosely” (past participle strewn). It is easy to associate this word with the PIE *strew- meaning “to spread”, which is indeed the origin of strew.

The sound of strew /struː/ made me think of another English word construe (con- + strue), which originally meant “to form by putting together materials” and today means “interpret in a specified way”. This is not a coincidence, because construe comes from the Latin struō (meaning “I construct”, “I arrange”), which ultimately comes from the PIE *strew-.

As you probably notice, there are many words derived from struō: structure, construct, destruct, destroy, obstruct, instruct, instrument. Instruct has the prefix in- meaning “inside”, which makes the sense “build into” or “teach”. The suffix -ment in instrument, in this case, comes from the Latin suffix -mentum, which indicates the sense “medium” (cf. English ornament from ōrnō (I equip)).