compatible, dimple, freckle, ankle, knuckle, sprinkle, pebble, uncle, humble, fumble, turtle, spring scale, graduated cylinder, balance, mass, volume
Compatible: existing together harmoniously
Dimple: a small natural hollow in the cheek or chin
Freckle: small brownish spots on human skin, generally mostly found on the face.
Ankle: the joint between the foot and the leg
Knuckle: the rounded prominence formed by the ends of the two adjacent bones at a joint —used especially of those at the joints of the fingers
Sprinkle: small particles of candy used as a topping; to scatter in drops or particles
Pebble: a small usually rounded stone especially when worn by the action of water
Uncle: the brother of one’s father or mother
Humble: not proud or haughty : not arrogant or assertive
Fumble: to grope for or handle something clumsily or aimlessly
Turtle: a slow-moving reptile, enclosed in a scaly or leathery domed shell into which it can retract its head and thick legs.
Spring scale:Â 
Graduated cylinder:Â 
Balance: instrument for comparing the weights of two bodies  
Mass: a measurement of how much matter is in an object.
Volume: the amount of space that a substance or object occupies; example: water