Bless means to have an attitude of goodwill & prosperity towards someone.
It is the intent of sending to or desiring for inner growth prosperity and joy to the recipient.
A blessing is gratitude for and recognizing that you are specially loved or blessed.
“The word blessing evokes a sense of warmth and protection; it suggests that no life is alone or unreachable. Each life is clothed in raiment of spirit that secretly links it to everything else.” John O’DonohueFull Glossary Index