attachment vs grounding

attachment and grounding both are nouns.

Word	Noun	Adjective	Verb	Adverb
attachment	Yes	No	No	No
grounding	Yes	No	No	No

As nouns, grounding is a hyponym of attachment; that is, grounding is a word with a more specific, narrower meaning than attachment:

Other hyponyms of attachment include bonding, soldering, doweling, earthing, linkage, ligature, tying, welding, fixation.

attachment (noun)	grounding (noun)
the act of fastening things together	fastening electrical equipment to earth
the act of attaching or affixing something	education or instruction in the fundamentals of a field of knowledge
faithful support for a cause or political party or religion
a supplementary part or accessory
a connection that fastens things together
a writ authorizing the seizure of property that may be needed for the payment of a judgment in a judicial proceeding
a feeling of affection for a person or an institution