As adjectives the difference between busy and loud
is that
busy is crowded with business or activities; having a great deal going on while
loud is of great intensity.
As a verb busy
is to make somebody
busy, to keep busy with, to occupy, to make occupied.
As a noun busy
is {{cx|slang|UK|Liverpool|derogatory|lang=en}} A police officer.
As an adverb loud is
loudly.
As a proper noun Loud is
{{surname}.