Puzzle 4

Underwater character with square pants

Instrument made of wooden bars of graduated length

Grave marker

Medical device that stimulates the heart

Person employed to update historical records

Sentimental recollections of the past

Special right or advantage given to certain groups

Digging animals do to create tunnels underground

Lively and active

A person's significant other on February 14th

Final chuckle

Open space in a railway terminal, for example