One Word Substitution

That which cannot be understood is called intelligible.

Physician is a person who is legally qualified to practice medicine.

Speedometer is an instrument on an automobile or other vehicle for indicating the rate of travel in miles or kilometers per hour.

Democracy is a system of government where power is vested in the people, who exercise it directly or through freely elected representatives.

Queue is a file or line, especially of people waiting their turn.

A morgue is a building or room where dead bodies are kept before burial or cremation. A mob is a disorderly crowd, and a museum is a place for historical or scientific exhibits.

Ineligible refers to someone who does not meet the necessary requirements or qualifications for a position. Inevitable means something that cannot be avoided, and invoice is a bill for goods or services.

A hotel is a commercial establishment that offers lodging to travelers. 

An illiterate person is someone who lacks the ability to read or write. Literate is the opposite, while legible and illegible refer to the clarity of handwriting.

Waterproof materials are designed to prevent water from passing through them. Usurer is a person who lends money at high interest, and wireless refers to communication without cables.

A dictionary is a reference book that lists words in alphabetical order and provides their definitions. A diary is for personal records, and a directory lists names or addresses.

An emissary is a person sent on a special mission, often as a diplomatic representative. Embezzle means to steal money, and an elegy is a poem of mourning.

Polygamy is the practice or condition of having more than one spouse, especially wife, at one time.

Blasphemy is the act of insulting or showing contempt for God or sacred things. Booth and brittle are unrelated to religious language.

An anthropologist is a scientist who studies human societies, cultures, and their development. An anthology is a collection of literary works.

 I immigrated from the U.S. to India. Thus, I am an immigrant.

Honorary work is performed without payment, often as a gesture of respect or for a cause. Homicide is the killing of a person, and illicit means illegal.

A nursery is a place where young plants are grown for sale or transplanting. Obsolete means outdated, and martyr refers to someone who dies for a cause.

An egoist is a person who is self-centered and thinks only of their own interests. Eternal means lasting forever, and examine means to inspect.

Democracy is a system of government where power is vested in the people and exercised by their elected representatives. Monarchy is rule by a king or queen, and theocracy is rule by religious leaders.

Inexcusable describes an action or behavior that cannot be justified or forgiven. Inaudible means unable to be heard, and lunar relates to the moon.

An alien is a person who resides in a country but is not a citizen of that country. A migrant is someone who moves from one place to another, and an emigrant is someone who leaves their own country.

Evitable means capable of being avoided. Edible means fit to be eaten, and delible means capable of being erased.

An amateur is someone who engages in a pursuit, especially a sport, on an unpaid rather than a professional basis. Anarchy is a state of disorder due to absence of authority.

A correspondent is a person employed by a news organization to report on news from a particular place or subject. A private is a low-ranking soldier, and a corpse is a dead body.