Walking in sleep :

• Hallucination
• Somniloquism
• Somnambulism
• Soliloquy

A name adopted by an author in his writings :

• Title
• Pseudonym
• Nickname
• Nomenclature

Official in-charge of a museum :

• Curator
• Administrator
• Dean
• Supervisor

Science dealing with Birds. (one word substitution)

• Etymology
• Philology
• Ornithology
• none of these

One who is from 60 to 69 years old. (one word substitution)

• Sexton
• Sexagenarian
• Sextuplet
• none of these

Young cow that has not yet had a calf. (one word substitution)

• Cowlet
• Ewe
• Heifer
• none of these

That which would burn easily. (one word substitution)

• Incendiary
• Inflammable
• Incandescent
• none of these

One who eats human flesh. (one word substitution)

• Cannibal
• Beast
• Carnivorous
• Furious

An unmarried man. (one word substitution)

• Bachelor
• Master
• Miser
• Spinster

A man who looks on the bright side of things. (one word substitution)

• Optimist
• Pessimist
• Snob
• Cynic