For me, they are two words: neck and collerón; I don't know if somewhere they are used together to name something .
NECK COLLERÓN typing error . It was missing to separate both almost synonymous terms by a comma. See COLLERÓN or what Claudia explained earlier.
refer to the artifact that is placed around the neck to protect the cervicals , term also used in veterinary for the Elizabethan neck that is placed on the animlaes after an intervention