Theory:

Meanings of the difficult words from "SindbadMy First Voyage":
 
S.No
Words
Meanings
1
SailorA person whose job it is to work as a member of the crew of a commercial or naval ship
2
ProtagonistThe leading character or one of the major characters in a play, film and novel
3
Abbasid Relating to a dynasty of caliphs who ruled in Baghdad from 750 to 1258
4
CaliphateThe rule or reign of a caliph or chief Muslim ruler
5
YearnedHave an intense feeling of longing for something
6
Slaying monsters Encountering monsters; killing monsters
7
Story-cycleSometimes referred to as a story sequence or composite novel
8
PorterA person employed to carry luggage and other loads, especially in a ship, airport, hotel and railway station
9
ImmaturityBehaviour that is appropriate to someone younger
10
LavishlySpending money without any boundary
11
ImmenseExtremely large or great, especially in scale or degree
12
LivelihoodThe money people need to pay for food, a place to live, and clothing
13
LuxuriousExtremely comfortable or elegant, especially when involving great expense
14
WelfareThe health, happiness, and fortunes of a person or group
15
Persian GulfA sea in Western Asia
16
CrewA group of people who work on and operate a ship and aircraft
17
IslandA piece of land surrounded by water
18
TremblingShaking of ground 
19
GrabbedGrasp or seize suddenly and roughly
20
PassengersA traveller on a public or private conveyance other than the driver, pilot, or crew
21
EntertainmentAn event, performance, or activity designed to entertain others
22
HungryHaving a strong desire or craving for food
23
Terrified Cause to feel extreme fear
24
JerkA quick, sharp, sudden movement
25
FortunateFavoured by or involving good luck; lucky
26
StrugglersA person who struggles with difficulties or with great effort
27
TossedMove or cause to move from side to side or back and forth
28
Exhausted State of feeling very tired
29
ClungHold on tightly to
30
Constant
Occurring continuously over a period of time
31
CrawlMove forward on the hands and knees or by dragging the body close to the ground
32
QuenchSatisfy one's thirst by drinking
33
ThirstA feeling of needing or wanting to drink something
34
DwellingA shelter such as a house in which people live
35
StrangeNot previously visited, seen, or encountered; unfamiliar
36
MisfortuneAn unfortunate condition or bad luck
37
HardshipSevere suffering or privation 
38
SympathizedFeel or express sympathy
39
PatheticArousing pity, especially through sadness
40
WitnessedSee an event, typically happened
41
UnimaginableDifficult or impossible to imagine or comprehend
42
WondersA feeling of amazement and admiration, caused by something beautiful, remarkable, or unfamiliar
43
PortA town or city with a harbour or access to navigable water where ships load or unload
44
ApproachingComing nearer in distance or time
45
Surprised Of something unexpected
46
AliveA person, animal, or plant living, not dead
47
Farewell An act of parting or of marking someone's departure
48
ExpensiveCosting a lot of money
49
GenerosityThe quality of being kind and generous
50
Tale A fictitious story, especially one that is imaginatively recounted
51
Amazing Very impressive; excellent
52
BadeUtter a greeting or farewell to
53
VoyageA long journey involving travel by sea or in space
54
HostA person who receives or entertains other people as guests
55
GratitudeThe quality of being thankful