Theory:

 
No.
Words
Synonyms
1
AwareConscious
2
BadInferior
3
BloomFlourish
4
DeserveWorthy
5
DifferenceVariation
6
ForgottenNeglected
7
FreeComplimentary
8
FriendPal
9
ImportantSignificant
10
KindConsiderate
11
LessonsLearnings
12
Love
Affection
13
Matter
Important
14
Respect
Regard
15
Room
Space
16
Sad
Unhappy
17
Shame
Humiliate
18
Simple
Easy
19
Tiniest
Smallest
20
PlantingSowing
 
Important!
To practise more synonyms, click here.