“SULFIDS” is a valid word. — 11 points Scrabble

fluida substance that is fluid at room temperature and pressure
fusila light flintlock musket
sildsany of various young herrings (other than brislings) canned as sardines in Norway

fussan excited state of agitation
slidmove obliquely or sideways, usually in an uncontrolled manner
lidseither of two folds of skin that can be moved to cover or open the eye
disstreat, mention, or speak to rudely
sudsthe froth produced by soaps or detergents
fils100 Yemeni fils are worth one Yemeni rial
flusan acute febrile highly contagious viral disease
sildany of various young herrings (other than brislings) canned as sardines in Norway
fids
fuds

ishave the quality of being; (copula, used with an adjective or a predicate noun)
if
usNorth American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
ida state in the Rocky Mountains
lia soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
sia tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors

SULFIDS