s, d, e, f, n, c, r, t, i, u, v are letters that make 'defensive structure'
structure, re, si, fen, en, SI, defensive, iv, CT, IV, Ur, DE, Re, Fe, Ru, Si are words within 'defensive structure'
1 possible definitions for 'defensive structure'
Under this definition, defensive structure is a noun and has the following properties:
'defensive structure' can be a type of structure, construction.
chevaux-de-frise, fortification, munition, fortress, fort, line of defense, outwork, stronghold, fastness, cheval-de-frise, line of defence are types of 'defensive structure'.