Lexicology

The word nice used to mean “foolish” in Middle English, but today it means “pleasant.”

The word PEN originally meant a FEATHER used for writing

The word "salary" comes from Latin "salarium", originally meaning “money given for salt.”

In modern English the word GREEN can mean the COLOR or ECOLOGICALLY FRIENDLY

The word computer once meant “a person who calculates”; today it refers to a machine

The word mouse can mean both an animal and a computer device in Modern English.

The word HOLIDAY comes from HOLY DAY and originally had a religious meaning

Today, the word cool is often used to mean “fashionable” or “good.”

In Present-Day English, "information is uncountable", so we say "much information", not "informations".

In Old English, the plural of "house" was "hus" with a different vowel, but today it is "houses".

The difference between CHILD, KID, and INFANT

The word "broadcast" originally referred to "scattering seeds" in a field; now it means "transmitting radio/TV programs".

In English, the plural of "tooth" is "teeth", not "tooths".

The word girl once meant “a young person”, but now it means “a female child.”

In Modern English, "go" has the irregular past tense "went".

In English today, the word "literally" is often used as an "intensifier", even when something is not literal.