Final answer:
The absolute superlative for the Spanish word 'rico' is 'riquísimo'.
Step-by-step explanation:
The absolute superlative for the Spanish word rico (meaning 'rich' or 'tasty') is riquísimo. In the absolute superlative form, the spelling change occurs in the ending of the adjective. The final -o is replaced with -ísimo for masculin and -ísima for feminine, resulting in riquísimo for masculine singular, riquísimos for masculine plural, riquísima for feminine singular, and riquísimas for feminine plural.