Theory:

Meanings of difficult words from the poem "The School Boy":
 
S.No
Words
Meanings
1
MornMorning
2
Distant Far away in space or time
3
Huntsman A person who hunts
4
Wind To produce sound from an instrument by blowing
5
HornA wind instrument, conical in shape or wound into a spiral, originally made from an animal horn (now typically brass) and played by lip vibration
6
Skylark A bird known for its songs, especially for its high notes
7
OutwornOut of date; no longer usable or serviceable because of excessive use
8
SighTo emit a long, deep audible breath expressing sadness, relief, tiredness, or similar
9
DismayA feeling of unhappiness and disappointment
10
Droop To bend or hang down heavily
11
Anxious Worried and nervous; eager to do something
12
DelightGreat pleasure or satisfaction
13
BowerA shady and pleasant place (so here, it is a place where sunlight hardly enters)
14
Thro’ Through
15
Dreary Depressingly dull and bleak or repetitive
16
Tender Young, inexperienced, or vulnerable; (of a plant) easily injured by severe weather or careless handling and therefore needing protection
17
Youthful Characteristic of young people, or relating to the period of life when one is young
18
SpringThe season after winter and before summer, in which vegetation begins to appear; (metaphorically) relating to the period of life when one is young
19
Bud A small part of a plant, that develops into a flower or leaf
20
Nip’dNipped; having removed something by pinching or squeezing sharply
 21
Strip’dStripped; having deprived someone of their possession
22
BlossomsFlowers