Large is an Adjective
Fish is a Noun
Swim is a Verb
Swiftly is an Adverb
In is a preposition
The is a determiner
Sea is a noun.
I hope this helps since you didn't say which word is italicized.
The main purpose of the transition word in the sentence: "Meanwhile, Jacey waited for the fitting room to become available." is that it connects a series of similar events. Explanation: Meanwhile can be defined as the time before something happens or before something ends, it is another way to say "during this time".
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Answer: No, it is not a run-on sentence</h3>
This is one full thought that doesn't run on for too long. The "overcome with joy" portion is the dependent clause that needs the other part "Mrs. Monroe told her husband the exciting news about her promotion" which is the independent clause. The independent clause could be its own sentence without the dependent clause, but not the other way around.