The word "flustrate" is a colloquial term used to describe a feeling of confusion, embarrassment or frustration. However, there are several synonyms that can be used in its place to convey the same meaning. For example, the words "befuddle," "puzzle," "bewilder," and "discombobulate" all describe a state of confusion or perplexity. Similarly, the words "rattle," "unsettle," "jangle," and "irritate" can be used to convey a sense of frustration or annoyance. In addition, the word "disconcert" describes a feeling of unease or discomfort, which can also be synonymous with "flustrate." Ultimately, the use of synonyms allows for more nuanced and varied expressions of complex emotions and experiences.