Concept:
This is a letter rearrangement pattern.
Step 1:Analyze GARNISH $\rightarrow$ RGAINHS}
Write positions:
\[
G \; A \; R \; N \; I \; S \; H
\]
Rearranged as:
\[
R \; G \; A \; I \; N \; H \; S
\]
Pattern:
3rd → 1st
1st → 2nd
2nd → 3rd
5th → 4th
4th → 5th
7th → 6th
6th → 7th
Step 2:Apply to GENIOUS:
\[
G \; E \; N \; I \; O \; U \; S
\]
Rearrange:
\[
N \; G \; E \; O \; I \; S \; U
\]
Step 3:Final Answer:
\[
\text{NGEOISU}
\]