"One" can be a pronoun, but I think I would use "those" in this instance, too.
If you are apologizing for the delay in your *reply*, then no. If you are apologizing for the delay to an e-mail caused by your mail provider, then possibly yes, but it should be "sorry for the delay *to* this e-mail" or similar.
A synonym is a word that has a similar meaning to another word. Eg. Correct and right
There is only one correct spelling for "basement" (cellar).A similar word is abasement (reducing in value or honor).
'Carry' is one word, 'on' is another. Some airlines may say "carryon" but they are incorrect. - Another similar word is 'carrion' referring to dead meat.
There is no particular phobia for being replaced, but there are similar phobias that are similar: Autophobia - fear of being alone or by oneself. Metathesiophobia - fear of changes.
Is it just the cluster or the whole dash lights are out? If whole dash check the fuse or as I have had similar problem light this was the headlight switch and replaced it.
'Robe' is correct for something you wear similar to a coat
If the fractions are similar, they will simplify to the same fraction.
The correct spelling is "similar."
Yes, "similar to" is grammatically correct and commonly used to show a comparison between two things that are alike. For example: "This dress is similar to the one she wore last week."
The correct spelling is "similar" (alike).
The spelling of "similar" and "simile" have some similarity. (definition : alike, related in appearance or usage)