High-up and Tower of strength

High-up noun - An important or influential (and often overbearing) person.

Tower of strength and high-up are semantically related. In some cases you can use "Tower of strength" instead a noun phrase "High-up".

Tower of strength noun - A person who can be relied on to give a great deal of support and comfort.

High-up and tower of strength are semantically related. Sometimes you can use "High-up" instead a noun phrase "Tower of strength".