Week 18, Artie's Spelling Words This is an attempt to make my son's studying more fun! These are his spelling words for week 18. Tools A B aquarium aquarium mortgage mortgage lateral lateral hospitalize hospitalize hostile hostile simultaneous simultaneous dissimilar dissimilar quadrilateral quadrilateral hostage hostage liberate liberate inexplicable inexplicable duplicate duplicate instruction instruction structural structural destruction destruction suspense suspense independently independently interrupt interrupt suspended suspended applicable applicable advocate advocate various various terrain terrain determine determine concentric concentric eccentric eccentric exterminate exterminate territory territory vague vague variation variation conspiracy conspiracy maternal maternal inspiration inspiration perspective perspective matrimony matrimony speculate speculate spectacle spectacle exclude exclude disrespect disrespect seclusion seclusion anxiety anxiety decision decision cruel cruel excitable excitable customary customary controversial controversial fallacy fallacy defenseless defenseless courtesy courtesy especially especially