Answer: MUIDATS

Explanation:
Word: PANCREAS
Pattern : Letters in the word are reversed. Code: SAERCNAP
Similarly, the code for STADIUM is MUIDATS.

Answer: ENIESTMNT

Explanation:
                               123456789
                      Word.HYPERBOLA
                        Code :YPROHEBLA
                                    235 7 1 46 89
The letters in the prime numbered positions are arranged first followed by the remaining letters. Similarly, the code for SENTIMENT is ENIESTMNT.

Answer: UCCAETAR

Explanation:
Word : REGISTRATION
Pattern: The word is divided into two equal halves and the letters in each half are reversed.
Code :TSIGERNOITAR
Similarly, the code for ACCURATE is UCCAETAR.

Answer: SFEVDUJPO

Explanation:
Word:      L    I   B   E   R  A   L
Pattern : +1 +1 +1 +1+1+1 +1
Code:        M  J   C   F  S  B  M
Similarly, the code for REDUCTION is SFEVDUJPO.

Answer: GLIMPSE

Explanation:
Word:      M A   J   E   S T   Y
Pattern: +1 -1 +1 -1 +1 -1 +1
Code:      N  Z   K  D   T  S Z
The word which is coded as
H     K  J   L   Q  R  F is
-1 +-1 -1 +1 -1 +1 -1
G     L   I    M   P S E

Answer: SIRWM'

Explanation:
Word:       M   l    N    U    T     E
Pattern : +1 +4 +9 +16 +25 +36
Code:       N   M  W   K    S    O
Similarly, the code for REIGN is SIRWM.

Answer: RBNJPHJ

Explanation:
Word:    M  I    R   A  G E
Pattern:x2 x2 x2 x2 x2 x2
Code:    Z   R  J   B   N J
Similarly, the code for INTRUDE is RBNJPHJ