Preliminary

Ans: (A) change

Explanation:
Synonym of vicissitude-
variation
change
shift
change of fortune
life’s ups and downs (informal)

Reference Link: https://www.collinsdictionary.com/dictionary/english-thesaurus/vicissitude

Ans: (D) haughty

Explanation:
Synonym of supercilious-
scornful
arrogant
contemptuous
disdainful
lordly
proud
lofty
stuck-up (informal)
patronizing
condescending
imperious
overbearing
snooty (informal)
haughty
high and mighty (informal)
vainglorious
toffee-nosed (slang, mainly British)
hoity-toity (informal)
uppish

Reference Link: https://www.collinsdictionary.com/dictionary/english-thesaurus/supercilious

Ans: (B) Calmness

Explanation:
Synonym of serenity-
calm
peace
tranquillity
composure
peace of mind
stillness
calmness
quietness
peacefulness
quietude
placidity

Reference Link: https://www.collinsdictionary.com/dictionary/english-thesaurus/serenity

Ans: (B) Secret

Explanation:
Synonym of Covert-
secret
private
hidden
disguised
concealed
veiled
sly
clandestine
underhand
unsuspected
surreptitious
stealthy

Reference Link: https://www.collinsdictionary.com/dictionary/english-thesaurus/philanthropist

Ans: (A) Humanitarian

Explanation:
Synonym of Philanthropist-
humanitarian
patron
benefactor
giver
donor
contributor
altruist
almsgiver

Reference Link: https://www.collinsdictionary.com/dictionary/english-thesaurus/philanthropist

Ans: (C) Cruelty

Explanation:
Synonym of Atrocity-
act of cruelty
wrong
crime
horror
offence
evil
outrage
cruelty
brutality
obscenity
wrongdoing
enormity
monstrosity
transgression
abomination
barbarity
villainy

Reference Link: https://www.collinsdictionary.com/dictionary/english-thesaurus/atrocity