anchorage vs anchorage ground

anchorage and anchorage ground both are nouns.

Word	Noun	Adjective	Verb	Adverb
anchorage	Yes	No	No	No
anchorage ground	Yes	No	No	No

As nouns, anchorage and anchorage ground are synonyms defined as:

anchorage (noun)	anchorage ground (noun)
the act of anchoring	place for vessels to anchor
place for vessels to anchor
a fee for anchoring
the condition of being secured to a base
the provision of a sense of security or steadfastness