一周年、两周年、四周年用英语怎么说？

Question

不是用anniversary这种，用一个单词表达，有时候商场几周年店庆的标语上会写，高手进来指点啊！！
终于找到了，给大家参考一下吧。
Annual - 1 year
Biennial - 2 years
Triennial - 3 years
Quadrennial - 4 years
Quinquennial - 5 years
Sexennial - 6 years
Septennial - 7 years
Octennial - 8 years
Novennial - 9 years
Decennial - 10 years
Undecennial - 11 years
Duodecennial - 12 years
Tredecennial - 13 years
Quattuordecennial - 14 years
Quindecennial - 15 years
Vigintennial or vicennial - 20 years
Semicentennial or quinquagenary - 50 years
Semisesquicentennial - 75 years "

Answer 1

a anniversary two anniversaries three anniversaries
four anniversaries
应该是这样吧!

Answer 2

there is no other words except anniversary. "anniversary" is perfect one. it is suitable.

参考资料：my idea

Answer 3

和anniversary周年搭着用就行了

Answer 4

annual