Puzzle 6

Aussie tennis pro who won 11 singles Grand Slams.

Changeableness, flexibility.

Giant Indonesian volcano that erupted in 1883.

Manicure applications that use an LED light.

To line a room with wooden boards and panels.

Type of bond containing free-moving electrons.

The late actor Omar Sharif's nationality.

Michelle Obama's memoir.

Round toy of soft foam meant to be thrown inside.

Hot pepper variety, often green and stuffed.

Eight-legged creature, e.g. spider or scorpion.

Youth is wasted on them.

A value that will always be the same in all cases.

Nickname of Beethoven's Piano Sonata No. 15 in D.

Similarity.

Decorating of shop windows.