This is the 9097th most frequent Spanish word.
walter
"Walter" is not a Spanish word; it is a proper name used in both English and Spanish-speaking contexts.
Here, 'Walter' is used as a proper noun to refer to a person named Walter.
Walter es mi vecino en la ciudad.
Walter is my neighbor in the city.
In this case, 'Walter' once again refers to the same individual, used to indicate someone with gardening expertise.
Siempre le pido consejos a Walter sobre mi jardín.
I always ask Walter for advice about my garden.
Here, 'Walter' is used possessively to show ownership of the dog by Walter.