discontent, dissatisfaction, fulfillment区别在哪？

维科英汉词典

discontent [dis·con·tent || ‚dɪskən'tent]
n. 不满牛津高阶英汉双解词典

discontent
/ ˏdɪskənˈtent; ˏdɪskənˋtɛnt/ (also discontentment / ˏdɪskənˈtentmənt; ˏdɪskənˋtɛntmənt/) n [U] ~ (with sth) lack of satisfaction 不满; 不满足; 不满意: The strikes were a sign of discontent (with poor pay). 那些罢工事件是（对低薪）不满的一种表示.
> discontented adj dissatisifed 不满的; 不满足的; 不满意的: discontented with one's job 对自己的职业不满意. discontentedly adv.朗道英汉词典

discontent [,diskәn'tent]
n. 不满美国传统词典[双解]

discontent
dis.con.tent
AHD: [d¹s”k…n-tµnt“]
D.J. [7d!sk*n6tent]
K.K. [7d!sk*n6tWnt]
n.（名词）
1. Absence of contentment; dissatisfaction.
不满足；不满意
2. A restless longing for better circumstances.
无止境的渴望：从不休止地渴望更好的环境
3. One who is discontented.
不满者，不满分子