Metric linear unit and Metric unit

Metric linear unit noun - A linear unit of distance in metric terms.

Metric unit and metric linear unit are semantically related. In some cases you can use "Metric unit" instead a noun phrase "Metric linear unit".

Metric unit noun - A decimal unit of measurement of the metric system (based on meters and kilograms and seconds).

Metric linear unit and metric unit are semantically related. Sometimes you can replace phrase "Metric linear unit" with "Metric unit", this phrases are similar.