As nouns the difference between covering and rhinotheca
is that covering is that which covers something while rhinotheca is the horny covering of the upper part of a bird's beak.
As a verb covering
is present participle of lang=en.
covering
English
Noun
(countable) That which covers something.
(uncountable) Action of the verb to cover .
Verb
(head)
rhinotheca
English
Noun
The horny covering of the upper part of a bird's beak