19 possible answers to
Answers with 3 characters: HUB NUB NUT SUM Answers with 4 characters: CORE CRUX MEAT PITH Answers with 5 characters: POINT SENSE TENOR Answers with 6 characters: KERNEL UPSHOT Answers with 7 characters: ESSENCE Answers with 8 characters: MAINIDEA SUMTOTAL Answers with 15 characters: HEARTOFTHEISSUE ROOTOFTHEMATTER SUMANDSUBSTANCE