What do "usury" and "a bribe" mean in 15:5?

"He who doesn’t lend out his money for usury, nor take a bribe against the innocent" (15:5). Usury is neshekh, which Brown-Driver-Briggs gives as "interest, usury (lit. something bitten off)" (tap usury). In the Law the WEB gives the same word as interest: "If you lend money to any of my people with you who is poor, you shall not be to him as a creditor. You shall not charge him interest" (Exodus 22:25); "You shall not lend him your money at interest, nor give him your food for profit" (Leviticus 25:37), of a brother who "has become poor" (Leviticus 25:35); and "interest of money, interest of food" (Deuteronomy 23:19). In that verse and the next, the WEB's lend on interest (Deuteronomy 23:19) and charge … interest (Deuteronomy 23:20) are a verb, not this word; Brown-Driver-Briggs gives it as "pay, give interest": "You may charge a foreigner interest; but you shall not charge your brother interest" (Deuteronomy 23:20). The psalm names no borrower. Bribe is shochad, "present, specif. bribe" (Brown-Driver-Briggs) (tap bribe). The Law says, "You shall take no bribe, for a bribe blinds those who have sight and perverts the words of the righteous" (Exodus 23:8), and "Cursed is he who takes a bribe to kill an innocent person" (Deuteronomy 27:25), where innocent is the Hebrew word of Psalm 15:5's innocent. The psalm doesn't cite these laws; they are set beside it here as they stand.