K to P
Key and Quay
Key can be an adjective meaning important or significant, e.g. The key points to consider were raised during the meeting. It can also be a noun meaning an instrument used for unlocking something, an aid used to solve a puzzle or game, and an explanation of markings on a map or street guide, e.g. We checked the key on the map to see how far we were from the next town. Quay is a noun and refers to a structure next to a body of water used for mooring boats, e.g. The old quay is popular with tourists but needs some reconstruction.
Loath and Loathe
Loath is an adjective which means unwilling or reluctant to do something, e.g. They were loath to go home as they were having such a good time. Loathe is a verb and means to hate or strongly dislike something or someone, e.g. She loathed narrow minded and stubborn people.
Magnate and Magnet
A magnate is someone who is powerful and influential often in a particular field of business or industry, e.g. He was a well known shipping magnate in the 1960´s. A magnet is a piece of metal which produces a magnetic field or something which attracts, e.g. The resort was a magnet for the rich and famous.
Observance and Observation
Observance refers to the practice of following or paying attention to laws, rules or customs, e.g. Drivers in this zone are expected to maintain a close observance of the speed limits. Observation is a process of perceiving or identifying information or fact, e.g. Only by close observation in hospital will the doctor be able to give an accurate diagnosis.
Practise and Practice
Practise is a verb meaning to do something regularly such as following rituals or to do something repeatedly in order to improve or maintain a good level in it, e.g. She practised her English by listening to English podcasts whilst driving to work. Practice is a noun which means the actual use of of an idea or method rather than the theories relating to it, i.e. put into practice, or the work of a professional such as a doctor, lawyer, dentist etc, e.g. My doctor has a practice next to the local primary school. Note that in American English, practice is more often used as both noun and adjective.