One Word Substitution

One who is out to subvert a government

Anarchist

One who is recovering from illness

Convalescent

One who is all powerful

Omnipotent

One who is present everywhere

Omnipresent

One who knows everything

Omniscient

One who is easily deceived

Gullible

One who works for free

Volunteer

One who does not make mistakes

Infallible

One who can do anything for money

Mercenary

One who has no money

Pauper

One who changes sides

Turncoat

One who loves books

Bibliophile

One who can speak two languages

Bilingual

One who loves mankind

Philanthropist

One who hates mankind

Misanthrope

One who looks on the bright side of things

Optimist

One who looks on the dark side of things

Pessimist

One who doubts the existence of god

Agnostic

One who pretends to be what he is not

Hypocrite

One incapable of being tired

Indefatigable

One who helps others Good

Samaritan

One who copies from other writers

Plagiarist

One who hates women

Misogynist

One who knows many languages

Polyglot

One who is fond of sensuous pleasures

Epicure

One who thinks only of himself

Egoist

One who thinks only of welfare of women

Feminist

One who is indifferent to pleasure or pain

Stoic

One who is quite like a woman

Effeminate

One who has strange habits

Eccentric

One who speaks less

Reticent

One who goes on foot

Pedestrian

One who believes in fate

Fatalist

One who dies without a Will

Intestate

One who always thinks himself to be ill

Valetudinarian

A Government by the people

Democracy

A Government by a king or queen

Monarchy

A Government by the officials

Bureaucracy

A Government by the rich

Plutocracy

A Government by the few

Oligarchy

A Government by the Nobles

Aristocracy

A Government by one

Autocracy

Rule by the mob

Mobocracy

That through which light can pass

Transparent

That through which light cannot pass

Opaque

That through which light can partly pass

Translucent

A sentence whose meaning is unclear

Ambiguous

A place where orphans live

Orphanage

That which cannot be described

Indescribable

That which cannot be imitated

Inimitable

That which cannot be avoided

Inevitable

A position for which no salary is paid

Honorary

That which cannot be defended

Indefensible

Practice of having several wives

Polygamy

Practice of having several husbands

Polyandry

Practice of having one wife or husband

Monogamy

Practice of having two wives or husbands

Bigamy

That which is not likely to happen

Improbable

People living at the same time

Contemporaries

A book published after the death of its author

Posthumous

A book written by an unknown author

Anonymous

A life history written by oneself

Autobiography

A life history written by somebody else

Biography

People who work together

Colleagues

One who eats too much

Glutton

That which cannot be satisfied

Insatiable

One who questions everything

Cynic

A flesh eating animal

Carnivorous

A grass eating animal

Herbivorous

One who lives in a foreign country

Immigrant

To transfer one's authority to another

Delegate

One who is a newcomer

Neophyte

That which is lawful

Legal

That which is against law

Illegal

One who is unmarried

Celibate

A game in which no one wins

Draw

A study of man

Anthropology

A study of races

Ethnology

A study of the body

Physiology

A study of animals

Zoology

A study of birds

Ornithology

A study of ancient things

Archaeology

A study of derivation of words

Etymology

Murder of a human being

Homicide

Murder of a father

Patricide

Murder of a mother

Matricide

Murder of an brother

Fratricide