Long time and Long-term

Long time noun - A prolonged period of time.

Long-term and long time are semantically related. In some cases you can use "Long-term" instead an adjective phrase "Long time".

Long-term adjective - Relating to or extending over a relatively long time.

Long time and long-term are semantically related. Sometimes you can replace phrase "Long time" with "Long-term", this phrases are similar.