Strong's H8636תַּרְבִּית: multiplication, i.e. percentage or bonus in addition to principal KJV:increase, unjust gain.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 2103: רָבָהrābâ — be, become, much, many, great; become many, numerous, grow great; make large, increase; make much, make great; archer, be in authority, bring up, enlarge, excel, exceeding, exceedingly, be full of, grow up, heap, be long, more…