
1) Best of times 2) Bloom 3) Blossom 4) Efflorescence 5) Exclusively Anglo word 6) Exclusively Saxon word 7) Flower 8) Flush 9) Golden age 10) Golden period 11) Golden years 12) High point in a career 13) Historical novel 14) Peak 15) Period 16) Period of greatest success 17) Period of greatest vigor 
Found on 
https://www.crosswordclues.com/clue/heyday

1) Efflorescence 2) Era 3) Golden age 4) High day 5) Peak 6) Primetime 7) Rejoicing 8) Zenith 
Found on 
https://www.crosswordclues.com/clue/heyday
 [horse]
[horse]  Heyday was a horse that competed in the sport of eventing, ridden by American Bruce Davidson. He was one of the Top Ten All American High Point Horses of the Century in eventing. He stands 16hh (163 cm). Heyday was very successful at a young age, competing at the advanced level at the age 6. He went on to represent the United States...
Found on 
http://en.wikipedia.org/wiki/Heyday_(horse)

expression of elation or wonder
Found on 
http://phrontistery.info/h.html

• (interj.) An expression of frolic and exultation, and sometimes of wonder. • (n.) The time of triumph and exultation; hence, joy, high spirits, frolicsomeness; wildness.
Found on 
http://thinkexist.com/dictionary/meaning/heyday/
 Hey'day`  interj.
Hey'day`  interj. [ Confer German 
 heida , or 
 hei da , Dutch 
 hei daar . Confer 
 Hey , and 
 There .] An expression of frolic and exultation, and sometimes of wonder. 
 B. Jonson. Found on 
http://www.encyclo.co.uk/webster/H/42
 Hey'day`  noun
Hey'day`  noun [ Prob. for. 
 high day . See 
 High , and 
 Day .] The time of triumph and exultation; hence, joy, high spirits, frolicsomeness; wildness. « The 
 heyday in the blood is tame.» 
 Shak. « In the 
 heyday of their victories.» 
 J...Found on 
http://www.encyclo.co.uk/webster/H/42

 the period of greatest prosperity or productivity
Found on 
https://www.vocabulary.com/lists/388513
 [Intelligent words]
[Intelligent words] the period of greatest prosperity or productivity
Found on 
https://www.vocabulary.com/lists/52473
  No exact match found.