One Word Substitution

A cynic is a person who believes that people are motivated purely by self-interest and is often skeptical or sneering.

A stroll is a leisurely walk, typically taken for pleasure or relaxation.

A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host.

A messenger is a person who carries a message or is employed to carry messages.

An assassin is a person who murders an important person, often for political or ideological reasons.

A polygon is a plane figure with at least three straight sides and angles. While pentagons and octagons are polygons, 'polygon' is the general term for any figure with more than four sides.

Fastidious describes a person who is very attentive to and concerned about accuracy and detail, often making them hard to please.

Parole is the temporary release of a prisoner who agrees to certain conditions before the completion of a maximum sentence period.

An aquarium is a transparent tank of water in which fish and other water creatures and plants are kept.

 Ochlophobia is the fear of crowds.

An arbitrator is an independent person or body officially appointed to settle a dispute.

A memento is an object kept as a reminder or souvenir of a person or event.

An inaugural speech is one given at the beginning of a term or ceremony to mark its commencement.

An emigrant is a person who leaves their own country in order to settle permanently in another. An immigrant is a person who comes to live permanently in a foreign country.

Correct answer is "highbrow". 

A colleague is a person with whom one works in a profession or business.

"Contemporary" meaning living or happening in the same period of time is the correct answer. 

A fleet is a group of ships sailing together, engaged in the same activity, or under the same ownership.

Credulous describes a person who is too ready to believe things, often without sufficient evidence.

A calligraphist (or calligrapher) is a person who practices calligraphy, which is the art of beautiful handwriting.

A novice is defined as a person who is new to or inexperienced in a field or situation. Apprentice is also similar, but novice is the more general term for someone just starting to learn.

A malcontent is a person who is chronically dissatisfied and rebellious. Heresy refers to beliefs contrary to orthodox doctrine, while felon and surrogate have unrelated meanings.

A laundry is a place or room where clothes and linens are washed. Mortuary is for the dead, while a wardrobe is for storing clothes.

Inalienable refers to rights or possessions that cannot be taken away or transferred. Edible means fit to be eaten, and legible means clear enough to read.

An introvert is a person who is predominantly concerned with their own thoughts and feelings rather than with external things. Extrovert is the opposite, and eccentric refers to unconventional behavior.