Man pages matching name bio::ontology::relationshiptype in section 3pm:

Bio::Ontology::RelationshipType.3pm.en	debian 10 / libbio-perl-perl
Bio::Ontology::RelationshipType.3pm.en	debian 11 / libbio-perl-perl
Bio::Ontology::RelationshipType.3pm.en	debian 12 / libbio-perl-perl