Final answer:
The misspelling of 'brother' as 'brudr' does not illustrate a feature of Spanish. It is a misspelling in English.
Step-by-step explanation:
The misspelling of "brother" as "brudr" does not illustrate a specific feature of Spanish. It is actually an example of a misspelling in English. The correct spelling of 'brother' in English is with the letters 'th'.