Search in Excel specific word, delete all rows who does not have that word

Hello,

I have an Excel file with 3000 rows. Target is that I input a column (the column where Excel has to search in) in an inputbox and a name in another input box, the vba macro is analyzing the excel file and removes all the rows who are not fulfill the inserted criteria.
Somebody created already something for me, but the function like in the search function "match entire cell contents" is unusable in that code.

Code:

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Sub DelRows()    Application.ScreenUpdating = False
    Dim a, b, nc As Long, i As Long, Col As String, response As String
    Col = InputBox("Enter the column letter:")
    response = InputBox("Enter the taxonomy:")
    nc = Cells(1, Columns.Count).End(xlToLeft).Column + 1
    a = Range(Col & "1", Range(Col & Rows.Count).End(xlUp)).Value
    ReDim b(1 To UBound(a), 1 To 1)
    For i = 1 To UBound(a)
      If Not a(i, 1) Like "*" & response & "*" Then b(i, 1) = 1
    Next i
    With Range(Col & "1").Resize(UBound(a), nc)
      .Columns(nc).Value = b
    '  .Sort Key1:=.Columns(nc), Order1:=xlAscending, Header:=xlNo, _
    '        OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, DataOption1:=xlSortNormal
      .Sort Key1:=.Columns(nc), Order1:=xlAscending, Header:=xlNo, _
            OrderCustom:=1, MatchCase:=True, Orientation:=xlTopToBottom, DataOption1:=xlSortNormal
   
   
      On Error Resume Next
      .Columns(nc).SpecialCells(xlConstants).EntireRow.Delete
      On Error GoTo 0
    End With
    Application.ScreenUpdating = True
End Sub

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Imagine you have an Excel:

1 Tree
2 Trees
3 Trees; leaf
4 Tree; leaf

I want to have (like in script above):

1. An inputbox who is asking in which column has to be searched. (already written)
2. An inputbox who is asking WHAT I want to search (already written but do not 100% like I want because Tree and Trees are shown!)
3. The first row of the Excel must been frozen (= not deleted)
4. All the rows who are not fulfilling the input criteria of item 2 => delete these rows completely

So If we should run now the script on the example I gave here above (the 4 lines) (show the exact match "Tree"), the result should be:
1 Tree
4 Tree; leaf

I have read that the "find-function" has a "Match entire cell contents" option, but I have no idea at all to transform the already written content and merge with the new coding. Hope somebody can help a dummy.

Rough algorithm:

Code:

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arrCol = ColumnRange.Value
for j = Ubound(arrCol) to LBound(arrCol)
  arrCel = Split(arrCol(j, 1), ";")
  Bool = False
  for i = Lbound(arrCel) to Ubound(arrCel)
      If arrCel(i) = Response Then
        Bool = True
        Exit For
      End If
  Next i
'For Testing:
  If Not Bool Then Rows(j + StartRowNum - 1).Interior.ColorIndex = 3
'For Production
'  If Not Bool Then Rows(j + StartRowNum - 1).Delete
Next j

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