10-Letter Words Containing: S,P,E,N

• Like a sphinx, or like that of a sphinx. Especially, not showing emotion

• Mysterious; scheming; having a deceptive outward appearance

• any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active

• a protein that combines with a coenzyme to form an active enzyme

• someone who is unimportant but cheeky and presumptuous

• a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets

• an alloy of copper and zinc that is used in cheap jewelry to imitate gold

• serving as an imitation or substitute

• a small short-billed Old World snipe

• American sandpiper that inflates its chest when courting